Question [Q]when i answered a call ,my touch screen and all buttons are not working at

i just performed an upgrade to [ROM][STABLE][Android 4.4.4] CyanogenMod 11 with 3.0.16 kernel [July 25, 2014] release
wiped cache+dalvik
flashed ROM
flashed kernel
reboot
the device booted successfully
now when i answered a call ,my touch screen and all buttons are not working at all,i have to reboot to get it working (except vol, power button )

thanks